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Buku Teks SO
Sage Publications, 1978
Buku Teks
Henderson, Gordon G.
Harper and Rows, 1976
Buku Teks SO
Ware, Alan
Oxford University Press, 1996
Buku Teks SO
contributors, Frederick C. Barghoorn ... [and others] ; edited by Sigmund Neumann
University of Chicago Press, 1956
Buku Teks SO